SAT官方每日一题:2011年10月16日
 2012-03-04来源:互联网
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2011年10月16日
考试类型:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.

  In the figure above, inscribed triangle  is equilateral. If the radius of the circle is
 is equilateral. If the radius of the circle is  , then the length of arc
, then the length of arc  is
 is
  A. 
  B. 
  C. 
  D. 
  E. 
| 正确答案:A 解析: An equilateral triangle has three equal sides, so the lengths of the three arcs must be equal, and thus each arc is  | 
 
       of the circumference of the circle. The circumference of the circle is
 of the circumference of the circle. The circumference of the circle is  , so the length of arc
, so the length of arc  is
 is  of
 of  , or
, or  .
. 
               
               
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